Yeah. I honestly want to keep NAT in IPv6 purely from a security and privacy standpoint.
Without it you have to get into a rather complex traffic shaping firewall configuration, that will in all probability be full of holes.
But carrier grade NATs just mean one more way that ISPs will be able to control what we do.
Just, the corporate powers that be will do anything to boost their profits. And if carrier-grade NATs are cheaper than backend upgrades, you can bet that's what they'll do.